Character Tropes

Brother-Sister Team: In Springfield Bound X, Bart and Ling are this on occasion, even though they are cousins (and not even blood relatives).

Older Than She Looks: Ling becomes this in Springfield Bound X. Even though she looks like a toddler, she is actually 7 (Given the fact that her timeskip design is heavily based on her appearance in the episode, The Changing of the Guardian. In addition, most children at the age of 7 would already have full-grown overbites by then).